The RT Patch---what needs to be done to get it into Mainline ---Steven Rostedt
2017-07-28 22:51
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1、什么是实时补丁
实时补丁目标：做一个确定的操作系统
如何实现：
高优先级任务立即响应
中断控制
增加抢占区域
阻止无限的延迟（unbounded latency）
中断控制
中断控制线程化（除了定时器中断—必须控制调度）
中断处理优先级化（作为线程处理后的进一步处理）
中断可以被抢占
增加抢占区域
不禁止中断
不禁止抢占
这两个都阻止任务调度
大多数有自旋锁(spin_lock()s)存在的地方禁止中断和抢占
实时可抢占(PREEMPT_RT)将自旋锁转换为可睡眠的互斥锁（调用者可睡眠）
他们不禁止中断或者抢占
甚至spin_ lock _ irq()也不会禁止中断
实时补丁目标：做一个确定的操作系统
如何实现：
高优先级任务立即响应
中断控制
增加抢占区域
阻止无限的延迟（unbounded latency）
中断控制
中断控制线程化（除了定时器中断—必须控制调度）
中断处理优先级化（作为线程处理后的进一步处理）
中断可以被抢占
增加抢占区域
不禁止中断
不禁止抢占
这两个都阻止任务调度
大多数有自旋锁(spin_lock()s)存在的地方禁止中断和抢占
实时可抢占(PREEMPT_RT)将自旋锁转换为可睡眠的互斥锁（调用者可睡眠）
他们不禁止中断或者抢占
甚至spin_ lock _ irq()也不会禁止中断
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